CMC Web UI not working when network is redundant mode

Question

Hi

we have this issue that when both CMC management is both patched at the same time the UI cannot be accessed. I can ping the IP and I can SSH to it except for the UI

Additionally, I have intermittent access to the iDRAC UI of all the blade servers under it even though ping is consistent.

When only connected to 1 management interface, everything works well. I'm pretty sure this is a management network redundancy issue.. but not sure how to fix it.

Daniel My · Accepted Answer

We have a Dell M1000e with redundant management ports, and it we are having issues when BOTH management networks are connected at the same time. I can ping the CMC mgmt IP and I can access it via SSH, but for some reason I cannot access the CMC GUI.

However, when only connected to 1 management interface, everything works well.

I still don't fully understand what you are doing.

If you are referring to the connection as when you have a network cable attached from each of the two CMC GB1 ports to your switch then that is not how the CMCs work. The redundancy is active/passive so you should not be able to SSH or connect in any way to the passive controller. If having the passive controller connected to your switch causes the EWS of the active controller to not function then that is likely an issue with your switch blocking traffic to stop a broadcast storm since the passive controller should not be on the network.

If you are referring to having GB1 and GB2 on the active CMC connected to your switch at the same time causing network traffic to not work properly then yes, they are working as intended. They are not supposed to be connected that way. GB1 should be connected to your network to allow access to the CMC. GB2 is for daisy chaining CMCs together. GB2 should only be connected to GB1 of another CMC in another chassis(not the redundant CMC in the same chassis).

Thanks

Daniel My · Answer

Hello

You have not provided enough information for anyone to assist.

What system is this(M1000, M1000e, VRTX, etc)?
What firmware version are you updating from and to that is causing this behavior?

when both CMC management is both patched at the same time the UI cannot be accessed

When only connected to 1 management interface, everything works well

Could you clarify what you are having issues with. Are you saying that when you run a FW update with redundant CMCs you cannot access the EWS or that you cannot access the CMC or iDRAC EWS with more than one simultaneous connection?

Is the issue resolved by restarting the CMCs and allowing them to fail over or by removing them and allowing them to restart?

Thanks

rasengan08 · Answer

Hi

I am unable to reply to my original post so I am re-posting..

CMC Information:
Primary CMC Location      = CMC-2
Primary CMC Version       = 5.00
Standby CMC Version       = 5.00
Last Firmware Update      = N/A
Hardware Version          = A09

We have a Dell M1000e with redundant management ports, and it we are having issues when BOTH management networks are connected at the same time. I can ping the CMC mgmt IP and I can access it via SSH, but for some reason I cannot access the CMC GUI. In Addition, I can also access the iDRAC UI of all the blade servers under it.. but not the CMC GUI itself

However, when only connected to 1 management interface, everything works well.

Systems Management General

CMC Web UI not working when network is redundant mode

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